<template>
    <div class="sidebar">
        <el-menu
                class="sidebar-el-menu"
                :default-active="onRoutes"
                :collapse="collapse"
                background-color="#324157"
                text-color="#bfcbd9"
                active-text-color="#20a0ff"
                unique-opened
                router>

            <template v-for="item in items">
                <template v-if="item.children">
                    <el-submenu :index="item.url+''" :key="item.id">
                        <template slot="title">
                            <i :class="item.icon"></i>
                            <span slot="title">{{ item.cname }}</span>
                        </template>
                        <template v-for="subItem in item.children">
                            <el-submenu
                                    v-if="subItem.children"
                                    :index="subItem.url+'' "
                                    :key="subItem.id"
                            >

                                <template slot="title">
                                    <i :class="item.icon"></i>
                                    {{ subItem.cname }}
                                </template>
                                <el-menu-item
                                        v-for="(threeItem,i) in subItem.children"
                                        :key="i"
                                        :index="threeItem.url+''"
                                >
                                    <i :class="item.icon"></i>{{threeItem.cname }}</el-menu-item>
                            </el-submenu>
                            <el-menu-item
                                    v-else
                                    :index="subItem.url+''"
                                    :key="subItem.id">
                                <i :class="item.icon"></i>
                                {{ subItem.cname }}
                            </el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.url+''" :key="item.id">
                        <i :class="item.icon"></i>
                        <span slot="title">{{ item.cname }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
    import bus from '../common/bus';
    import {getData} from "@/api";
    export default {
        data() {
            return {
                collapse: false,
                items: [],
            };
        },
        methods: {
            async getMenus() {
                const res = await getData('/sys/resources/menu')
                if(res.code === SUCCESS_CODE){
                    this.items =res.data
                }
            }
        },
        computed: {
            onRoutes() {
                return this.$route.path.replace('/', '');
            }
        },
        created() {
            // 通过 Event Bus 进行组件间通信，来折叠侧边栏
            bus.$on('collapse', msg => {
                this.collapse = msg;
                bus.$emit('collapse-content', msg);
            });
            this.getMenus()
        }
    };
</script>

<style scoped>
    .sidebar {
        display: block;
        position: absolute;
        left: 0;
        top: 70px;
        bottom: 0;
        overflow-y: scroll;
    }
    .sidebar::-webkit-scrollbar {
        width: 0;
    }
    .sidebar-el-menu:not(.el-menu--collapse) {
        width: 250px;
    }
    .sidebar > ul {
        height: 100%;
    }
</style>
